Resilient journal box mounting

ABSTRACT

A RESILIENT MOUNTING FOR A RAILWAY TRUCK FRAMING ELEMENT ON A JOURNAL BOX COMPRISING A PEDESTAL JAW HAVING INWARDLY AND UPWARDLY SLOPING SIDES AND HORIZONTAL TOP, A JOURNAL BOX HAVING SIMILARLY SLOPING SIDES AND A HORIZONTAL TOP WIDER IN PROPORTION TO THE HEIGHT OF ITS SIDES THAN THE PEDESTAL JAW TOP, AND A MOLDED ELASTOMERIC PAD OF INVERTED GENERALLY U-SHAPED HAVING A RELATIVELY THICK CENTRAL TOP PORTION PORTIONED BETWEEN THE OPPOSING TOPS OF THE JOURNAL BOX AND PEDESTAL JAW AND THINNER INCLINED END PORTIONS POSITIONED BETWEEN THE INWARDLY SLOPING OPPOSING SIDES OF THE JOURNAL BOX AND PEDESTAL JAW, THE JOURNAL BOX HAVING OUTWARDLY EXTENDING PERIPHERAL FLANGES SPACED APART A GREATER TRANSVERSE DISTANCE TRANSVERSELY THAN THE THICKNESS OF THE JAW, THE PAD HAVING PROTRUDING FLANGED MARGINAL PORTIONS COMPRESSED INTO THE INTERVENING SPACES BETWEEN THE JOURNAL BOX FLANGES AND THE OUTER AND INNER SURFACES OF THE FRAMING ELEMENT WHEREBY TO FIX THE TRANSVERSE PORTION OF THE JOURNAL BOX WITHIN THE PEDESTAL JAW.

Nov. 23, 1971 R. L. LICH RESILIENT JOURNAL BOX MOUNTING Filed March 6, 1969 United States Patent US. Cl. 105-224.1 Claims ABSTRACT OF THE DISCLOSURE A resilient mounting for a railway truck framing element on a journal box comprising a pedestal jaw having inwardly and upwardly sloping sides and a horizontal top, a journal box having similarly sloping sides and a horizontal top wider in proportion to the height of its sides than the pedestal jaw top, and a molded elastomeric pad of inverted generally U-shape having a relatively thick central top portion positioned between the opposing tops of the journal box and pedestal jaw and thinner inclined end portions positioned between the inwardly sloping opposing sides of the journal box and pedestal jaw, the journal box having outwardly extending peripheral flanges spaced apart a greater transverse distance transversely than the thickness of the jaw, the pad having protruding flanged marginal portions compressed into the intervening spaces between the journal box flanges and the outer and inner surfaces of the framing element whereby to fix the transverse portion of the journal box within the pedestal jaw.

BACKGROUND OF THE INVENTION Field of the invention The invention relates to railway rolling stock and consists particularly in a deformable cushion-type journal box mounting for car trucks.

The prior art The prior art discloses journal box mountings incorporating rubber pads between the vertical sides of a journal box and the vertical sides of the pedestal jaw, and level or sloping top surfaces on box and jaw between which flat rubber pads are interposed. In such arrangements, since the vertically disposed rubber pads at each side would yield solely in shear when vertically loaded, and since rubber has a relatively low shear rate compared to a much higher compression rate, the vertical load would be carried largely by the pads on top of the journal boxes which, if soft enough to provide substantial cushioning, would be so fully compressed under the load that little if any vertical cushioning would be provided.

SUMMARY OF THE INVENTION The inwardly sloping arrangement of relatively thin elastomeric pad portions between the sides of the box or adapter provides substantial resistance in compression in addition to substantial yieldability in shear whereby to relieve the thick horizontal pad portion between the top of the box or adapter and the top wall of the pedestal jaw of some of the vertical load and thereby permit it to be sufl'iciently soft to provide substantial cushioning. The high resistance of the side portions of the pad to compression longitudinally of the truck and of its inner and outer margins to compression between the box or adapter flanges and the inner and outer longitudinal walls of the pedestal jaw holds the box or adapter and the associated wheel and axle assembly against any substantial movement longitudinally or transversely of the pedestal and the frame structure of which the pedestal is a part. Further, the elastomeric pad, by its intervention between all "ice the interfaces of the journal box or adapter and the pedestal jaw, prevent metal-to-metal contact and the consequent wear and transmission of noise and vibration from the track to the truck framing.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of the pedestal portion of a arilway truck side frame and associated journal box mounting.

FIG. 2 is a longitudinal vertical sectional view of the structure shown in FIG. 1 taken along the longitudinal center line, line 22 of FIG. 3.

FIG. 3 is a fragmentary transverse vertical sectional view along line 3-3 of FIGS. 1 and 2.

FIG. 4 is a fragmentary nearly horizontal sectional view along line 4-4 of FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENT The numeral 1 denotes the side frame of a railway truck. Side frame 1 may be of box section having separate transversely spaced longitudinally extending vertical side walls 3 and 5 and vertically spaced top and bottom walls 7 and 9 connecting said side wall.

Adjacent the end of the side frame, bottom wall 9 is recessed upwardly to form a pedestal jaw having side wall portions 11 sloping upwardly toward each other and connected to each other by a horizontal top wall portion 13 and side frame side walls 3 and 5 are correspondingly upwardly recessed. Preferably the angle of slope of pedestal side wall portions 11, 11 is only a few degrees (in the order of 1015) from the vertical.

Journal box 15 has sloping sides 17 of the same inclination as pedestal jaw side wall portions 11 and a flat top 19 which is wider in proportion to the height of box sides 17 than pedestal top wall portion 13 is in proportion to the height of the pedestal side wall portions so that, when the box is centered between side wall portions 11 of the pedestal jaw, the vertical space between the box top and the pedestal jaw top wall portion will be substantially greater than the normal distance between the journal box sides while the inclination of said pedestal jaw side wall portions 11 and journal box sides 17 is such that a substantial portion of the straight side 11 of the pedestal jaw is directly above a portion of the corresponding straight side 17 of the journal box.

A molded elongated rectangular pad of elastomeric material of inverted U-shape in side elevation having a thick central top portion 21 and thinner inclined end portions 23 is positioned between the transverse surfaces of the box and the corresponding wall portions of the pedestal jaw, with thick central top portion 21 of the pad occupying the deep space between top 19 of the box and top wall portion 13 of the pedestal jaw and thinner end portions 23 of the pad occupying the narrower spaces between sides 17 of the box and side wall portions 11 of the pedestal jaw.

It will be seen, therefore, that substantial relative movement of the journal box and side frame 1 longitudinally of the truck will be prevented by the high resistance of end portions 11 of the pad to compression, while substantial vertical cushioning movement of the box with respect to the side frame will be permitted by reason of the low vertical shear resistance of the pad end portions 11 and the slight vertical compressive resistance of the pad end portions 23, as well as by the increased vertical flexibility of the pad top portion resulting from its thickness.

For positively positioning the journal box transversely of truck side frame 1, the journal box is provided with outer and inner flanges 25 and 27 which are sufliciently wide to overlap the margins of side walls 3 and 5 adjacent the pedestal jaw and are transversely spaced apart a slightly greater distance than the thickness of the side frame. The marginal portions of the pad 23, 21, 23 protrude from the sides of the side frame and are formed with outwardly extending flanges 29, which extend into the spaces between side frame side walls 1 and the journal box flanges and there prevent transverse movement of the journal boxes by their resistance to compression while providing some cushioning by reason of their resiliency.

For preventing undesired separation of the journal box from the side frame, journal box flanges 25 and 27 are extended upwardly as at 31 and 33 respectively to a level higher than the top wall 7, and in spaced relation thereabove are formed with transversely aligned circular apertures 37 and 39 respectively, through both of which a pin 41 extends and is retained therein by a cotter pin 43 or other suitable means. This arrangement eliminates the necessity of the usual pedestal tie bars and substantially simplifies removal and replacement of journal boxes and their associated wheel and axle assemblies by requiring only the removal of pin 41 rather than the loosening and tightening of bolts by which the usual pedestal tie bars are secured to the pedestal legs and removal and replacement of the pedestal tie bars.

I claim:

1. A resilient mounting for a railway truck framing element comprising a downwardly open pedestal jaw in the framing element having substantially inwardly and upwardly sloping straight sides and a flat horizontal top, a journal box positioned within said jaw and having similarly sloping straight sides and a flat horizontal top and an elongated pad preformed with a thick center portion and substantially thinner end portions, said center portion being positioned between the opposing tops of said pedestal jaw and said journal box said thinner end portions being positioned respectively between the opposing sides of said pedestal jaw and journal box whereby to space the opposing tops of said journal box and pedestal jaw a substantially greater distance apart than the respective opposing sides of said journal box and pedestal jaw, said pad forming the sole support of said pedestal jaw top and sides from corresponding parts of said journal box, the inclination of said pedestal jaw and journal box sides and the thickness of said pad end portions being such that a substantial portion of each said pedestal jaw straight side is directly above a portion of the corresponding straight side of the journal box.

2. A resilient mounting according to claim 1, wherein said pad is of inverted generally U-shape in side elevation.

3. A resilient mounting according to claim 2 wherein said journal box is formed with radial flanges along its periphery spaced apart a greater distance than the thickness of said pedestal jaw and of greater radial width than the thickness of adjacent portions of said pad, said pad having marginal portions protruding beyond the inner and outer surfaces of said pedestal jaw and extending radially outwardly between said pedestal jaw inner and outer surfaces and said journal box flanges and being compressed therebetween to prevent substantial lateral movement of said box with respect to said pedestal jaw.

4. A resilient mounting according to claim 3 in which both said journal box flanges are extended upwardly to a higher level than the top of the framing element and are there formed with transversely aligned openings, there being a pin passing through both said openings and over the framing element in vertically spaced relation therewith under normal operating conditions for preventing vertical separation of the framing element from said journal box.

5. A resilient mounting according to claim 4 wherein said pad has marginal portions protruding radially between said flanges and the respective inner and outer surfaces of said pedestal jaws.

References Cited UNITED STATES PATENTS 3,276,395 10/1966 Heintzel --224.1 1,575,277 3/1926 Pilcher 105220 2,207,848 7/1940 Barrows 105-2241 2,251,950 8/1941 Pil'on l05-224.1 X 3,211,112 10/1965 Baker 105-224.1 3,274,955 9/1966 Thomas 105224.l

FOREIGN PATENTS 622,205 11/1935 Germany 105-2241 ARTHUR L. LA POINT, Primary Examiner H. BELTRAM, Assistant Examiner US. Cl. X.R. 

